2014 HSC Extension 2 Maths Carrotsticks' Solutions (2 Viewers)

[Carrotsticks]

BTW WHY IS MULTIPLE CHOICE 6d)?? Am I missing something?

Which was this again? The template had all answers being D initially, so I may have missed it.

 

[Carrotsticks]

Also, for the angle between two lines, I didn't get rid of absolute values. Can somebody clarify?

 

[mreditor16]

Which was this again? The template had all answers being D initially, so I may have missed it.

nah 6 is D

OP, take a look at the integrals limits.

 

[aDimitri]

just checking the soln's in q16bi had a (-1)^n on the numerator of the GP after summed

bump

 

[Carrotsticks]

bump

Somebody check this, I may have made an error when copy pasting the equations or typing them.

 

[rumbleroar]

Also, for the angle between two lines, I didn't get rid of absolute values. Can somebody clarify?

You get rid of it because you're given the condition a>b but in the brackets it's b^2-a^2, which is negative according to the condition

 

[IR]

nah 6 is D

OP, take a look at the integrals limits.

Shit. My bad carrot. I see so 5/10 multiple choice wrong.

 

[IR]

BTW carrot for 15c) iii) where you have to show increasing function is it valid to show in equivalent of sin theta/cos^2theta in terms of v, where derivative of both sides in respect to v gives 2lg/v^3, where v>0 for v>0 considering cos theta is even function which is >0 for -pi/2<theta<pi/2

 

[Trebla]

Meanwhile I'm still doing solutions for BoS trials ext1 lol

 

[Sy123]

Alternate solution for Q16 (c)



I might try to look for alternate solutions than Carrot's and post them here

 

[bishay]

i think i got about 65% am i stuffed?

 

[iStudent]

Also, for the angle between two lines, I didn't get rid of absolute values. Can somebody clarify?

Great train by the way (Y)
Who doesn't like thomas

 

[iStudent]

Would you get 1 mark if you just did substitution and did the +1 -1 trick but then you didn't get the final answer? (I wrote 3 booklets of junk in hope to scab marks). It seems awkward it's 3 marks allocated for what, 4 lines? lol

 

[integral95]

Can some one PM me the link for the paper lol?

 

[dan964]

your justification for question 2 although valid, is probably not the most effective way to do it.
I did it by difference of two squares or something like that.

 

[dan964]

then again q11 was harder than most q11

 

[Mikasa]

Q16)
u = xlnx
dv/dx =1/x(1+lnx)^2

my friend did it in like 3 lines, lol.

 

[dan964]

the paper.
Q16 (c) was a nice question, and so happy to get it out...
Paper:
http://community.boredofstudies.org...-mathematics-extension-2-a-8.html#post6773919

 

[rumbleroar]

Would you get 1 mark if you just did substitution and did the +1 -1 trick but then you didn't get the final answer? (I wrote 3 booklets of junk in hope to scab marks). It seems awkward it's 3 marks allocated for what, 4 lines? lol

Yeah I reckon you would

 

[MadLife]

Can some one PM me the link for the paper lol?

Me too thanks!